Theoretical study of the N N --> N N pi pi reaction

Details Theoretical study of the N N --> N N pi pi reaction Theoretical study of the N N --> N N pi pi reaction

1997-06-18

arxiv.org/abs/nucl-th/9706046v2

Nucl.Phys. A633 (1998) 519-546

Physics

Nuclear Physics

Nuclear Theory

22 pages, 12 postscripts figures, revised: a more general N* N pi pi Lagrangian is considered, to be published in Nucl. Phys.

Scientific paper

10.1016/S0375-9474(98)00126-2

We have developed a model for the N N --> N N pi pi reaction and evaluated cross sections for the different charged channels. The low energy part of those channels where the pions can be in an isospin zero state is dominated by N* excitation, driven by an isoscalar source recently found experimentally, followed by the decay N* --> N (pi pi, T=0, s-wave). At higher energies, and in channels where the pions are not in T=0, Delta excitation mechanisms become relevant. A rough agreement with the experimental data is obtained in most channels. Repercussions of the present findings for the ABC effect and the p p --> p p pi0 reaction close to threshold are also suggested.

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